"To lose one's shit" has a very similar meaning as "to lose one's mind" Except your mind is brown, ugly,
smelly, often watery, and is being
dropped in, and clogging toilets at an alarming
rate, as we speak.
To lose one's shit, can be used in this
case.
Guy: Was
Kanye on grass when he wrote "Lift Yourself"?!
Guy 2: Fo' sheezy nigga, he lost his shit.